|Pos.|Time|Athlete|Country|Venue|Date|
|---|---|---|---|---|---|
|1|12.21 (+0.7)|Yordanka Donkova|Bulgaria|Stara Zagora|20 August 1988|
|2|12.25 (+1.4)|Ginka Zagorcheva|Bulgaria|Drama|8 August 1987|
|3|12.26 (+1.7)|Ludmila Narozhilenko|Russia|Seville|6 June 1992|
|3|12.26 (+1.2)|Brianna Rollins|United States|Des Moines|22 June 2013|
|5|12.28 (+1.1)|Sally Pearson|Australia|Daegu|3 September 2011|
|6|12.33 (−0.3)|Gail Devers|United States|Sacramento|23 July 2000|
|7|12.36 (+1.9)|Grażyna Rabsztyn|Poland|Warsaw|13 June 1980|
|8|12.37 (+1.5)|Joanna Hayes|United States|Athens|24 August 2004|
|8|12.37 (-0.2)|Dawn Harper|United States|London|7 August 2012|
|10|12.39 (+1.5)|Vera Komisova|Soviet Union|Rome|5 August 1980|
|10|12.39 (+1.8)|Nataliya Grygoryeva|Soviet Union|Kiev|11 July 1991|
|12|12.42 (+1.8)|Bettine Jahn|East Germany|Berlin|8 June 1983|
|12|12.42 (+2.0)|Anjanette Kirkland|United States|Edmonton|11 August 2001|
|14|12.43 (-0.9)|Lucyna Kalek|Poland|Hannover|19 August 1984|
|14|12.43 (-0.3)|Michelle Perry|United States|Carson|26 June 2005|
|14|12.43 (+0.2)|Lolo Jones|United States|Beijing|18 August 2008|
|14|12.43 (+1.2)|Queen Harrison|United States|Des Moines|22 June 2013|
|18|12.44 (-0.5)|Gloria Siebert|East Germany|Rome|4 September 1987|
|18|12.44 (-0.8)|Olga Shishigina|Kazakhstan|Lucerne|27 June 1995|
|18|12.44 (+0.4)|Glory Alozie|Nigeria|Monaco|8 August 1998|
|18|12.44 (+0.6)|Damu Cherry|United States|Lausanne|7 July 2006|
|22|12.45 (+1.3)|Cornelia Oschkenat|East Germany|Neubrandenburg|11 June 1987|
|22|12.45 (+1.4)|Brigitte Foster-Hylton|Jamaica|Eugene|24 May 2003|
|22|12.45 (+1.5)|Olena Krasovska|Ukraine|Athens|24 August 2004|
|22|12.45 (+1.4)|Virginia Crawford|United States|New York City|2 June 2007|

Question: how many of the athletes came from the united states?
Answer: 10